Apache OpenDAL™ C++ Binding

A C++ binding for OpenDAL, providing access to S3, GCS, Azure Blob, HDFS, the local filesystem, and 50+ more services through one API.

‍Note: This binding is experimental/WIP. Only Clang and AppleClang are currently supported. The API may change without notice.

We release the OpenDAL C++ binding independently of the opendal crate (Rust core). For updates and compatibility, use the C++ binding version instead of the opendal crate version.

Useful Links

• User guide: opendal.apache.org/docs/bindings/cpp
• Services & configuration: opendal.apache.org/services
• Source: bindings/cpp/
• Examples: examples/cpp/

Integration via CMake

FetchContent

include(FetchContent)
 
FetchContent_Declare(
  opendal-cpp
  GIT_REPOSITORY https://github.com/apache/opendal.git
  GIT_TAG        v0.40.0
  SOURCE_SUBDIR  bindings/cpp
)
FetchContent_MakeAvailable(opendal-cpp)
 
target_link_libraries(your_target opendal_cpp)

Vendored source

mkdir third_party && cd third_party
git clone https://github.com/apache/opendal.git
cd opendal && git checkout v0.40.0

add_subdirectory(third_party/opendal/bindings/cpp)
target_link_libraries(your_target opendal_cpp)

Prerequisites

• CMake ≥ 3.22
• Clang or AppleClang with C++17 support (C++20 required for async)

Build

mkdir build && cd build
cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ ..
make

CMake options

Option	Default	Description
OPENDAL_DEV	OFF	Enable all development options at once
OPENDAL_FEATURES	""	Comma-separated list of services, e.g. "opendal/services-s3"
OPENDAL_ENABLE_ASYNC	OFF	Enable async API (requires C++20)
OPENDAL_ENABLE_TESTING	OFF	Build and enable tests
OPENDAL_ENABLE_DOCUMENTATION	OFF	Build Doxygen docs
OPENDAL_ENABLE_ADDRESS_SANITIZER	OFF	Enable address sanitizer

Example

#include "opendal.hpp"
#include <iostream>
 
int main() {
    // Construct an operator. The second argument is a config map.
    opendal::Operator op("memory");
 
    // Write, read, stat.
    op.Write("hello.txt", "Hello, OpenDAL!");
    std::string data = op.Read("hello.txt");
    std::cout << data << "\n";
 
    opendal::Metadata meta = op.Stat("hello.txt");
    std::cout << "size=" << meta.ContentLength() << "\n";
}

See the user guide for more examples including streaming reads, directory listing, real backends, and the async API.

Contributing

See CONTRIBUTING.md at the repository root.

License and Trademarks

Licensed under the Apache License, Version 2.0: http://www.apache.org/licenses/LICENSE-2.0

Apache OpenDAL, OpenDAL, and Apache are either registered trademarks or trademarks of the Apache Software Foundation.